A substance that changes its colour when added to an acid or a base
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indicator
An indicator is a substance which changes its color in the presence of acid or base. It is indicative of acid and base in the solution. An indicator is used in chemical laboratory. An indicator is used in the titration process of the solutions to indicate the completion of the acid-base related reactions.
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Explanation:
An indicator is a substance which changes its color in the presence of acid or base.
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